JPH08238750A - Plate exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for replacing especially the printing plate of a plate cylinder for a sheet offset printer, which is of such a structure that the plate cylinder has a cylinder groove axially in parallel, a pad is provided on both end faces of the plate cylinder with each of strips which extends paral lelled to the axial line of the plate cylinder and is supported through a stopper, and the device is installed so as to freely come into contact with or disengage itself from this contact with the plate cylinder as a widely applicable type. SOLUTION: Two separate stoppers 10 protruding significantly toward a plate cylinder compared to a stopper 11 are provided and are made to act upon the plate cylinder 1 when the plate cylinder 1 comes to a corresponding position to the stoppers 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate plate exchanging device for a printing machine, particularly a sheet-fed offset printing machine, in which the plate cylinder has cylinder grooves parallel to each other, and pillows are provided on both end surfaces of the plate cylinder. Of the type in which strips extending parallel to the axis of the plate cylinder are supported by stoppers via stoppers and are attached to and released from the plate cylinder, respectively. .

[0002]

PRIOR ART German Federal Patent Publication No. 42159
No. 69 discloses a guide strip for feeding a printing plate, which is mounted on the plate cylinder so as to come into contact with and release from the plate cylinder. In order to supply a new plate, the plate cylinder is moved into position and the guide strip is brought into contact there. Furthermore, the gripper of the plate to be fed slides along the guide surface of the guide strip facing the plate cylinder into the open area of the clamp strip provided at the print start. The guide strip has stoppers at both ends, and is supported by the pillows of the body by the stoppers.

German Patent DE 42 14 207 discloses a pressure roller with folding strips which is mounted in contact with and released from the plate cylinder. The tensioning of the plate on the outer peripheral surface of the plate cylinder is performed by a pressing roller while the plate cylinder rolls forward. A folding strip is abutted in order to guide the grip of the printing plate in the tension strip attached to the printing end,
As a result, the bent portion at the printing end portion is bent. Since the folding strip does not have an adjustable stop, the strength of the folding applied to the plate, ie the degree of bending, cannot be changed.

According to DE-A-4339344, a guide strip having a guide surface for feeding a new printing plate is attached directly to a folding strip for folding the printing end of the printing plate. Is known.
In order to supply a new printing plate, a pressure roller with folding strips is brought into contact with the surface of the clamping strip associated with the printing start. After the plate has been tensioned on the outer surface of the plate cylinder, the folding strips are again brought into contact and the grip of the plate is then introduced into the tensioning strip to which it is attached. Here too, the folding strip is either supported directly on the front clamping strip or directly on the outer contour of the printing end of the plate cylinder, and thus for supplying a new printing plate, or The desired geometrical condition for guiding the printing end of the printing plate into the tensioning strip is defined by the corresponding design of the cooperating members, and thus changing this geometrical condition. I can't.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is therefore to improve the device described in the preamble of the claims and to increase the applicability of the device for replacing plate plates.

[0006]

According to the structure of the present invention which has solved this problem, two other stoppers are provided, and these stoppers are directed toward the plate cylinder more than the stoppers assigned to the pillow. Are largely projected and act on the plate cylinder at corresponding positions on the plate cylinder.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention shown in the drawings will be described below.

FIG. 5 shows a plate cylinder having a cylinder groove 3 provided in parallel with the axis. The plate cylinder 1 has pillows 2 at both ends. These pillows 2 cooperate in a known manner with the corresponding pillows of a rubber blanket cylinder (not shown). The tension strip 4 and the clamp strip 5 are respectively arranged at the printing start end portion, and are mounted in the cylinder groove 3 of the plate cylinder 1, respectively. Although not shown in FIG. 5 inside the tension strip 4 and the clamp strip 5, respectively, the plate cylinder 1
The print start end and the print end are fixed and stretched.

FIG. 6 shows a plate cylinder 1 having a plate plate 9. Folding strips 7 extend parallel to the axis of the plate cylinder, each end of the folding strip 7 extending beyond the size limit of the plate cylinder and includes an abutment and release device (not shown). It is supported so that it can be brought into contact with or released from the plate cylinder 1 via. For example, the respective contact and release devices each consist of a bearing lever mounted on the frame wall of the printing unit, which bearing lever is respectively connected to one end of the folding strip 7.

An adjustable set of stoppers, each of which has the shape of a screw, is mounted on the end of the folding strip 7, outside the maximum size of the plate, by means of which the stoppers are brought into contact. And the folding strip is pillow 2.
Alternatively, it is supported on the surface of the plate cylinder 1. As shown in FIGS. 1 and 2, the stoppers 10, 11 according to the invention are screwed into corresponding threaded holes in the folding strip,
The stopper 10 is provided for supporting on the surface of the plate cylinder 1, and the stopper 10 is provided for supporting the folding strip 7 on the pillow 2.
It projects more toward the plate cylinder 1 than 1 does.

3 and 4 show the position of the folding strip 7 with the guide strips 8. In FIG. 3, a pressing roller 6 which is parallel to the axial direction and which is provided for tensioning the printing plate bends the printing plate 9 so that the printing plate is provided at the printing end portion 5. It is abutted against the plate cylinder in order to guide it in 4. A folding strip 7 pivotally attached to the pressure roller 6 is brought into contact with the plate cylinder by another actuating member (not shown), such as a pneumatic cylinder. A guide strip 8 which is attached to the folding strip 7 and is used for feeding a new printing plate is also shown.

In FIG. 3, the stopper 10 is a drum groove 3 of the plate cylinder 1.
It shows that the folding strip 7 is supported in the pillow 2 of the plate cylinder 1 by the stopper 11.

FIG. 4 shows the position of the folding strip with the guide strip 8 for feeding a new printing plate into the open clamping area of the clamping strip 5 arranged at the start of printing. . As shown, the plate cylinder 1 rotates to a position in which a stopper 10 projecting toward the plate cylinder is supported on the outer peripheral surface of the plate cylinder 1, whereby a guide strip 8 is formed.
The folding strips 7 having the positions occupy the following positions with respect to the plate cylinder 1. In other words, the gripper of the plate 9 occupies a position on the side of the guide strip 8 facing the plate cylinder 1 so that it can slide into the clamping region of the clamp strip 5. Since the protruding stopper 10 further contacts the outer peripheral surface of the plate cylinder 1, the stopper 11 does not contact the outer peripheral surface of the pillow 2. The state shown in FIG. 4 is shown from another direction in FIG.

As previously mentioned, the stoppers 10, 11 are screwed into corresponding threaded holes in the folding strip 7. The folding strip 7 with the guide strips 8 can thereby be fixed in a precisely defined manner. That is, the clamp strips 5 of the plate cylinder are provided at the printing start end.
An optimum state can be formed for supplying a new plate into the plate. The optimum state is similarly formed at the printing end portion of the plate cylinder. Adapting the material of the stoppers 10, 11 formed as screws to the material of the plate cylinder 1 in order to form a support that the stoppers 10 and 11 in the plate cylinder 1 and the pillow 2, respectively, are not damaged. You can

According to another configuration of the present invention, the support surfaces for the two stoppers 10 are arranged on the plate cylinder 1 at positions adjacent to the pillow 2, respectively. In particular, these support surfaces can be provided on the end faces of the pillow 2 and the stopper 10
Can be prevented from being supported on the plate cylinder surface.

[Brief description of drawings]

FIG. 1 is a partial sectional partial view showing an operating state of two stoppers for fixing a folded strip at one position with respect to a plate cylinder.

FIG. 2 is a partial cross-sectional partial view showing an operating state of two stoppers for fixing the folding strip at different positions with respect to the plate cylinder.

FIG. 3 is a partial cross-sectional partial view showing the position of the folding strip with respect to the plate cylinder at the printing end defined by two stoppers.

FIG. 4 is a partial cross-sectional partial view showing the position of the folded strip with respect to the plate cylinder at the printing start edge defined by two stoppers.

FIG. 5 is a perspective view of a plate cylinder having cylinder grooves parallel to each other.

FIG. 6 is a partially cutaway side view of a plate cylinder having folded strips that extend beyond the width of the cylinder.

[Explanation of symbols]

1 plate cylinder, 2 pillow, 3 drum groove, 4 tension strip, 5 clamp strip, 6 pressing roller, 7 folding strip, 8 guide strip, 9 plate plate, 10 and 1
1 stopper

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Helmut Schilt Federal Republic of Germany Steinbach / Taunus im Wingelzgrund 148

Claims (5)

[Claims] 1. A device for replacing a plate of a plate cylinder of a printing machine, particularly a sheet-fed offset printing machine, wherein the plate cylinder has cylinder grooves parallel to each other, and both end faces of the plate cylinder are provided. Have pillows,
In the type in which strips extending parallel to the axis of the plate cylinder are respectively supported via stoppers on the pillow and are attached to the plate cylinder so as to come into contact with and release from the plate cylinder, , Two other stoppers (1
0) are provided, these stoppers project more toward the plate cylinder (1) than the stoppers (11) assigned to the pillow (2), and the corresponding positions of the plate cylinder (1). 2. An apparatus for exchanging a printing plate, characterized in that it acts on the printing drum (1). 2. Exchange device according to claim 1, characterized in that the stop (10, 11) is formed as a screw which is screwed into the threaded hole of the strip. 3. The stop (10) is adapted to act outside the maximum size of the plate on the surface of the plate cylinder (1) adjacent to the pillow (2). The exchange device according to claim 1 or 2. 4. A tension strip (4) which extends over the width of the plate cylinder (1) and is attached to the printing end.
Clamp strips which are formed as folding strips (7) for guiding the plate (9) therein and on which the gripper of the plate (9) is provided at the printing start end. 4. Exchange device according to any one of claims 1 to 3, characterized in that a guide strip (8) feeding into (5) is attached. 5. A support surface is assigned to two further stoppers (10) of the plate cylinder (1) at locations adjacent to the pillow (2), respectively. The exchange device according to any one of items 1 to 4.